BS 1646-4 84th Edition, April 30, 1984
Symbolic Representation for Process Measurement Control Functions and Instrumentation - Part 4: Basic Symbols for Process Computer, Interface and Shared Display/ Control Functions
Includes all amendments and changes through Reaffirmation Notice , February 1, 2012
Published By:British Standards Institution (BSI)
Specifies symbols to illustrate process computer and/or shared display/control functions in process measurement and control, e.g. on process flow diagrams. The symbols may be used in conjuction with the symbols given in Part 1 of BS 1646 but they do not provide a means of illustrating specific instruments or parts thereof.